From my understanding, Stefan GP are a highly credible operation and ready to go at the drop of a hat.
Also from my sources, its Kazuki Nakajimma in the #1 seat with either Christian Klien or Takuma Sato in seat # and the test seat.
They have got the full support of Toyota, a support that is simmilar in finance to what Brawn had from Honda and BMW Sauber currently have from BMW, $80million for the first season and $60 million for the second (if you remain in that guise, Brawn have not got that second payment as they are now Mercedes GP) whitch means they have the financial clout.
The fact that Panasonic and KDDI havnt jumped ship from Toyota says to me the combined $35million from both of those companies will be behing the operation as well, as both were looking towards BMW Sauber and Kimui at one point.
My chances of Stefan GP making it to Bahrain with the TF110 and RVX-09 engines is roughly 90% certanty. The team to drop out will be Campos Meta 1 for the reason that Textera isnt wanted in F1 as he more or less ran A1GP out of existance. And the fact that its rumored that Dallara have a $8million default to be paid to them from Campos as they have missed the first payment of 2010 for the development, build and running of the chassis, that 2 of whitch have been built already. With that i expect that USF1 to pick up Bruno Senna or for Bruno Senna to jump into a Test & Reserve role at a team that still has that posistion open, most posibly McLaren for 2010.
However, ill throw a curve ball on this one. If the FIA, FOTA and FOM allow all the new teams to default on 3 GPs each this year, Stefan GP could fill in on those GPs, meaning that they wont be contractually breached as much as they would have been if only 12 teams turn up for a race, for each race promoter.